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public Authentication getAuthentication(String token) {
        Claims claims = Jwts.parserBuilder().setSigningKey(this.secretKey).build().parseClaimsJws(token).getBody();

        Object authoritiesClaim = claims.get(AUTHORITIES_KEY);

        Collection<? extends GrantedAuthority> authorities = authoritiesClaim == null ? AuthorityUtils.NO_AUTHORITIES
                : AuthorityUtils.commaSeparatedStringToAuthorityList(authoritiesClaim.toString());

        User principal = new User(claims.getSubject(), "", authorities);

        return new UsernamePasswordAuthenticationToken(principal, token, authorities);
    }